Guns



ct. 6,1959 F, G, 'PRlETo 2,907,250

' GUNS Filed Nov. 4, 1954 s i GUNS l i Fernando Garcia Prieto, LosAngeles, Calif.

Application November 4, 19'54, Serial No. `466,856 1 claim. (ci. s9s

'Ihe present invention relates to improvements in guns, and the primaryobject of the invention is to provide a gun in which the energy of apowder charge is better utilized than in conventional guns.

Another object of the invention is to provide a gun in which two or morepowder charges are exploded to re a projectile, one outside and other orothers inside the barrel.

A further object of the invention is to provide a gun in which theconventional recoil is eliminated and .the force producing said recoilis utilized to increase the etiiciency of the gun.

The foregoing and other objects, features, and advantages of theinvention will become more clearly evident from the following detaileddescription of an exemplary form of the invention, the same beingillustrated in the accompanying drawing, in which:

Fig. l is a longitudinal sectional veiw of a gun embodying the presentinvention.

Fig. 2 is an enlarged sectional View showing a detail of the projectileused in said gun.

Figs. 3 and 4 are diagrams serving to illustrate the Pascals principleon which the present invention is based.

The gun shown in Fig. 1 comprises a cylinder 5 open at both ends andprovided with two groups of exhaust ports `6 and a powder port 7; a pairofpistons 8 and 9 arranged to slide within the cylinder and forming anexplosion chamber 10 between them; a casing 11 housing said cylinder; abarrel 12 forming a reduced extension of said casing; a three-throwcrankshaft 13 aiiixed to said casing, one crank being connected topiston 9 by rod 9a and the other cranks being connected to piston 8 byrods 8a and 8b which are united at 8c; an inertia member 14 connected toboth pistons 8 and 9 through said rods and crankshaft, said inertiamember being adapted to slide within the rear portion of the barrel 12;a projectile 15 adapted to slide within the barrel 12, said projectilehaving a compartment 15a for receiving a powder charge.

The barrel 12 has a longitudinal slot 12a intermediate the length ofsaid barrel. The outer end of said slot is dened by a shoulder 12b thatserves to inwardly flex a spring 15b carried by the compartment 15a andmovable along the slot 12a, said spring being provided with a prong 15Cto hit a percussion cap 15d (Fig. 2).

' The operation of the gun shown is as follows:

A powder charge is introduced in the explosion chamber 10 through theport 7, and said charge is ignited by conventional means (not shown).The resultant explosion urges both pistons 8 and 9 in oppositedirections along the cylinder l5. Said pistons, through the abovedescribed connections, simultaneously urge the inertia member 1'4 alongthe portion of the barrel 12 that is adjacent to the casing 11 and,therefore, transmit theirV kinetic energy to the projectile 15 incontact with said inertia member. lust before the pistons 8 and 9 reachZ,97,Z5 Patented Get. 6, 1959 2l their extreme outward positions, theyuncover the exhaust portsjl and the exhaust gases escape therethrough.The projectile 15 will move 'alongrthe barrel '12, and, when the spring.15b reaches the shoulder 12b, saidfspring will flex inwardly to pushits prong 15c`i nto the cap 15d,thus exploding the powder'chargey incompartmentlSci. `The burnt gases remaining in the cylinder V5 may bescavenged by conventional means (not shown), and the port 7 may be openand the operation repeated.

Fig. 3 shows a cylinder open at one end and closed at the other end andprovided with one piston. If an explosion is produced in the spacebetween said piston and said closed end, a pressure, represented byarrow a, is exerted on said piston and another pressure, represented byarrow b, is exerted on the closed end c. In a conventional gun thepressure represented by arrow a is exerted on the Aprojectile to impelit outward and the pressure represented by arrow b is exerted on theguns breech producing recoil, or, if the cylinder is open at both ends,as in the so-called bazooka gun, the energy of said pressure is lost.

Fig. 4 shows a cylinder open at both ends and provided with two opposed`pistons. lf an explosion is produced in the space between said pistons,a pressure a is exerted on piston 8 and a pressure b on piston A9.According to Pascals principle, both pressures are of equal intensityhaving equal maximum and equal minimum. If the charge exploded in therst cylinder is of the same force to that exploded in the lattercylinder, the average pressure on both cylinders will be equal.Consequently, pressure a and pressure b are of the same force in Fig. 4and in Fig. 3.

The energy of a powder charge, therefore, will produce in my gun twiceas much work as is produced in conventional guns, that is, theprojectile of the gun disclosed in the present application will be firedwith double energy than the projectile of conventional guns.

The explosion in chamber 10 exerts pressures of equal intensity in thepistons `8 and '9 and said pressures are simultaneously transmitted tothe member 14 urging forward said member and propelling the projectile15 in the same direction. l

Since the pressure on each piston is equal to that exerted on theprojectile of conventional guns, it will be evident that the impulseexerted on the projectile 15 will be twice as great to that exerted onthe projectile of co-nventional guns, if the powder charge is of thesame force in both cases.

Furthermore, the explosion in compartment 15a will produce an additionalimpulse on the projectile 15, thus increasing the velocity acquired bysaid projectile from the explosion in the chamber 10.

It will be also evident that the rotation of the crankshaft 13 will notaffect the gun structure since the speed of every point in a rotatingbody is proportional to its distance from the center of rotation and,consequently, the center line of the crankshaft 13 will remainstationary and no recoil can be produced. Also, when the piston 9 pushesdownward the crank of the crankshaft 13 connected to said piston, thepiston 8, simultaneously pulls upward the cranks connected to the latterpiston, and the forces acting on both pistons are counteracted by theforce of inertia opposed to said motion, both action and reactionbalancing each other.

Since variations of the present combination may be made within theconcept of the invention, l wish to reserve to myself all modicationsthereof that may fall within the scope of the pending claim.

I claim:

A gun comprising a casing, a cylinder inside-said casing, a barrelforming an extension of said casing and References Cited in the le ofthis patent adapted to house a projectile, a pair of opposed pistonsoperable in said cylinder and having an explosion cham- UNITED STATESPATENTS ber therebetween, an inertia member, and means con- 452,5675111011 May 19 1891 neting said member to said pistons, said memberbeing 5 689,745 Pratt DeC- 24, 1901 'vositionedto be impelled by bothpistons simultaneous- 1,314,801 HaIlZllk Sept. 2, 1919 1y and at the'same degree and rate ofjmovementrint 2,103,103 Waters Dec. 21, 1937said barrel upon separation of said pistons by 1n-empl() sive charge insaid explosion chamber, and saidprojectile FOREIGN PATENTS receiving thekkinetic energy of said member to be im- 10 917,369 France Sept. 9, 1946pelled outward from said barrel.

